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Mill Valley Foundation Repair & Underpinning Services

Proudly Providing Foundation Repair Services in Mill Valley, CA Since 1996

Mill Valley Foundation Repair Services

For almost three decades, our family-run company has specialized in the installation of Helical Piers and Tiebacks in Mill Valley. We are equipped to manage projects of all scales with a strong commitment to quality. Our reputation for honesty, dependability, and top-notch workmanship has earned us the trust of engineers and contractors throughout Mill Valley. We take immense pride in our family name being synonymous with outstanding service.

Common Residential Foundation Issues in Mill Valley, California

Homeowners in Mill Valley often encounter diverse foundation issues, influenced by the area’s distinctive soil composition, earthquake risks, and climatic conditions. Some frequent foundation problems in this region are:

  1. Soil Shrinkage and Expansion: Mill Valley, CA has a variety of soil types. Some soils can shrink and expand with changes in moisture levels. This can lead to foundation movement and damage.
  2. Earthquakes: Mill Valley is located in an earthquake-prone area. Earthquakes can cause severe foundation damage, including cracks and shifts in the foundation.
  3. Landslides and Soil Erosion: The hilly terrain of Mill Valley can lead to landslides and soil erosion, especially during heavy rains. This can undermine the stability of a home’s foundation.
  4. Poor Drainage: If water doesn’t drain properly away from a home, it can pool around the foundation. Over time, this can weaken the foundation and cause problems like cracks or sinking.
  5. Tree Roots: Large trees near a home can cause foundation issues. As tree roots grow, they can push against the foundation, causing it to crack or shift.
  6. Aging: Older homes in Mill Valley may have foundations that are deteriorating due to age. Over time, materials can break down, leading to foundation problems.
  7. Poor Construction: If a home was not built correctly, it could have foundation issues. This might include things like inadequate footings, poor soil compaction, or use of low-quality materials.

Proactive maintenance and regular inspections are key for Mill Valley homeowners to tackle these issues. Consulting foundation experts or structural engineers is advisable for addressing any arising problems.

We Provide the Following Foundation Repair Services in Mill Valley:

Helical Piers

Helical piers are deep foundation elements used to support and stabilize structures, particularly in situations where the soil beneath a building’s foundation is unstable or lacks sufficient load-bearing capacity. These piers consist of a steel shaft with helical (spiral) plates attached to it, resembling a large screw. They are screwed into the ground using hydraulic machinery until they reach a stable soil layer or bedrock, providing strong anchoring and support.

Helical piers may be required for a foundation when the existing soil is weak, expansive, or prone to shifting due to factors like moisture content, seasonal changes, or geological conditions. They are especially useful in areas prone to landslides, areas with high water tables, or when a building’s weight exceeds the natural soil’s ability to bear the load. By extending deep into stable soil layers or bedrock, helical piers transfer the structural load from the foundation to the stronger ground below, preventing foundation settling, sinking, or other stability issues.

Retaining Walls

Retaining walls are structures designed to hold back soil or other materials, preventing erosion and creating level surfaces on sloped landscapes. They are commonly used in areas with varying terrain to support the weight of the earth and maintain stability. Over time, retaining walls can experience wear and tear due to factors such as soil pressure, water saturation, freeze-thaw cycles, and general aging. When retaining walls exhibit signs of damage such as cracks, bulging, leaning, or shifting, it’s important to consider repairs. These repairs may involve addressing the structural integrity of the wall, regrading the area to alleviate pressure, improving drainage systems, or even replacing damaged sections. Regular inspections and proactive maintenance can help identify issues early and prevent more extensive repairs or replacements in the future.

Soil Nailing

Soil nailing is a geotechnical construction technique used to reinforce and stabilize soil slopes, excavations, or retaining walls. It involves installing relatively slender reinforcing elements, typically steel bars or rods, called “nails,” into the ground at a specific angle and spacing. These nails are grouted or bonded with materials like cement to create a composite mass that reinforces the soil structure. Soil nailing is employed to prevent slope erosion, control soil movement, and enhance the stability of cut or fill slopes, especially when dealing with loose or unstable soils. It’s commonly used in situations where conventional retaining walls might not be feasible due to space constraints, aesthetics, or construction challenges. Soil nailing provides an effective way to strengthen soil structures, mitigate the risk of landslides, and secure excavated areas or slopes against potential failure.

Seismic Retrofitting

Seismic retrofitting involves modifying and reinforcing existing buildings, structures, or infrastructure to enhance their ability to withstand seismic (earthquake) forces. This process typically involves strengthening key components, adding support systems, and implementing design changes to improve overall structural resilience. Seismic retrofitting is necessary in regions prone to earthquakes to ensure that older constructions meet modern safety standards and can endure the ground shaking and ground displacement that seismic events can generate. It helps reduce the risk of structural damage, collapse, and potential harm to occupants during earthquakes. Retrofitting can involve measures like adding steel braces, reinforcing concrete elements, upgrading foundations, and securing non-structural components. By enhancing a structure’s seismic performance, retrofitting helps protect lives, minimize property damage, and contribute to community safety in seismically active areas.

Erosion Control

Erosion control services involve implementing measures to prevent or manage the erosion of soil, sediment, and other materials caused by natural forces like wind, water, and human activity. These services aim to protect landscapes, construction sites, and properties from the adverse effects of erosion, such as soil loss, water pollution, and compromised stability. Erosion control techniques include the installation of erosion control products like geotextiles and mulch, the construction of retaining walls or terraces, planting vegetation to stabilize soil, and establishing proper drainage systems. Erosion control is essential to maintain the integrity of landscapes, prevent damage to infrastructure, preserve water quality, and ensure the sustainability of land for agricultural, environmental, and construction purposes.


Underpinning is a construction technique used to strengthen or stabilize the foundation of a building or structure. It involves the process of excavating and reinforcing the existing foundation or adding new support elements beneath it to enhance its load-bearing capacity and prevent settlement or structural damage. Underpinning may be necessary when a structure’s foundation is compromised due to factors like soil subsidence, shifting ground conditions, inadequate foundation design, or changes in nearby construction. Signs that a structure may need underpinning include cracks in walls, sloping floors, or doors and windows that no longer function properly. Underpinning can involve methods like installing concrete piers, micropiles, or helical piles to provide additional support and redistribute the structural load. It helps restore stability and prevent further damage, ensuring the safety and longevity of the building.

Residential Construction

Residential construction services encompass the design, planning, and building of homes, apartments, and other housing structures. These services include various stages of construction, from initial concept and architectural design to foundation work, framing, roofing, plumbing, electrical installations, interior finishes, and landscaping. Homeowners may require residential construction services when they are building a new home, expanding an existing one, or renovating to improve functionality, aesthetics, or energy efficiency. These services also address essential aspects of safety, compliance with building codes, and incorporating modern construction techniques and materials. Hiring residential construction services ensures that projects are executed professionally, with attention to detail and adherence to regulations, resulting in a safe and comfortable living space that meets the unique needs and preferences of the homeowner.

Civil Construction

Civil construction encompasses a broad spectrum of projects related to infrastructure and public works. This includes building roads, bridges, highways, airports, dams, water systems, and sewage treatment facilities.

These tasks involve comprehensive planning, design, execution, and management of major construction endeavors that are pivotal in enhancing and developing public infrastructure. Civil construction services are essential when there’s a need to construct or improve vital community amenities, expand transportation systems, manage water resources, or tackle environmental issues.

These services are vital for developing and upkeeping the physical framework that bolsters economic progress, ensures public safety, and improves living standards in both urban and rural settings. Successfully executing these large-scale projects typically demands specialized skills in engineering, project management, and adherence to regulatory standards, guaranteeing their effective completion and enduring viability.

Contact Us Today for Your Mill Valley Foundation Repair Needs